Scarce Anglo-Saxon Silver and niello penannular brooch circa 700-900 AD, metal detecting find, history retailer gift

Here we have a scarce incomplete Anglo-Saxon penannular brooch circa 700-900 AD.
Ar silver composition.
It displays a dark tone, large faceted terminal beautiful decorated with retailer signs of niello inlay, Uncleaned.
Overall condition is a low grade state because of it being incomplete but is a very exceptional piece nonetheless.
British found-Ex London collection.

Dimensions
Length: 3.7cm
Width: 0.7cm
Weight: 7.07g